Support for ARB_conditional_render_inverted (GL 4.5).

That was easy.

doc/opengl-support.dox

@@ -210,7 +210,7 @@ following:
 -------------------------------------------- | ------
 @extension{ARB,ES3_1_compatibility}          | |
 @extension{ARB,clip_control}                 | |
-@extension{ARB,conditional_render_inverted}  | |
+@extension{ARB,conditional_render_inverted}  | done
 @extension{ARB,cull_distance}                | |
 @extension{ARB,derivative_control}           | done (shading language only)
 @extension{ARB,direct_state_access}          | |

src/Magnum/SampleQuery.h

@@ -117,28 +117,58 @@ class SampleQuery: public AbstractQuery {
          */
         enum class ConditionalRenderMode: GLenum {
             /**
-             * If query result is not yet available, waits for it and
-             * then begins conditional rendering based on result value.
+             * If query result is not yet available, waits for it and then
+             * begins rendering only if result is nonzero.
              */
             Wait = GL_QUERY_WAIT,
 
             /**
-             * If query result is not yet available, OpenGL may begin
-             * rendering like if the result value was nonzero.
+             * If query result is not yet available, waits for it and then
+             * begins rendering only if result is zero.
+             * @requires_gl45 %Extension @extension{ARB,conditional_render_inverted}
+             */
+            WaitInverted = GL_QUERY_WAIT_INVERTED,
+
+            /**
+             * If query result is not yet available, begins rendering like if
+             * the result was nonzero.
              */
             NoWait = GL_QUERY_NO_WAIT,
 
+            /**
+             * If query result is not yet available, begins rendering like if
+             * the result was zero.
+             * @requires_gl45 %Extension @extension{ARB,conditional_render_inverted}
+             */
+            NoWaitInverted = GL_QUERY_NO_WAIT_INVERTED,
+
             /**
              * The same as @ref ConditionalRenderMode::Wait, but regions
              * untouched by the sample query may not be rendered at all.
              */
             ByRegionWait = GL_QUERY_BY_REGION_WAIT,
 
+            /**
+             * The same as @ref ConditionalRenderMode::WaitInverted, but
+             * regions untouched by the sample query may not be rendered at
+             * all.
+             * @requires_gl45 %Extension @extension{ARB,conditional_render_inverted}
+             */
+            ByRegionWaitInverted = GL_QUERY_BY_REGION_WAIT_INVERTED,
+
             /**
              * The same as @ref ConditionalRenderMode::NoWait, but regions
              * untouched by the sample query may not be rendered at all.
              */
-            ByRegionNoWait = GL_QUERY_BY_REGION_NO_WAIT
+            ByRegionNoWait = GL_QUERY_BY_REGION_NO_WAIT,
+
+            /**
+             * The same as @ref ConditionalRenderMode::NoWaitInverted, but
+             * regions untouched by the sample query may not be rendered at
+             * all.
+             * @requires_gl45 %Extension @extension{ARB,conditional_render_inverted}
+             */
+            ByRegionNoWaitInverted = GL_QUERY_BY_REGION_NO_WAIT_INVERTED
         };
         #endif